Suite numbers, unit numbers and why they matter

Use the building's own format. If the building writes "Suite 210", don't write "#210" in one place and "Unit 210" in another.

Put it on the second line if you can. Mapping apps read addresses more reliably when the suite sits on its own line.

Match your mail. The format your post office uses for your mail is a safe choice for listings too.

Moved within the building? Update the suite number everywhere at once.